The `range()` function requires at least one argument. Since Python indexing starts at `0`, using the **length of a sequence** as the sole argument allows iteration over all its indices.  

To get the sequence length, use the `len()` function. For example, you can loop through the list from previous sections, but this time by indexing its elements.

# Initial list
values = [1, [2, 3], 4, "code"]

# Initialize a for loop over indexes
for i in range(len(values)):
    print("Index:", i)
    print("Value:", values[i])
    print("----") # Delimiter

At each iteration of the loop, the variable `i` **sequentially traverses the indices** of `values`, ranging from `0` to `3`.

When using `range(len(values))` to iterate over a list, what does the variable `i` represent?  

Python is an interpreted high-level general-purpose programming language. Unlike HTML, CSS, and JavaScript, which are primarily used for web development, Python is versatile and can be used in various fields, including software development, data science, and back-end development. In this course, you'll explore the core aspects of Python, and by the end, you'll be crafting your own functions!

Dive into the basics of Python, explore your workspace, and perform simple math operations. Learn how to write readable code using comments and handle both basic and advanced mathematical expressions while displaying your results.

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Master the art of writing loops in Python—essential constructs for iterating over lists, tuples, dictionaries, and other data structures. Learn to use while and for loops effectively, explore the range function, and work with nested loops to handle complex iteration patterns.

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How to Iterate Over Indexes in Python